A203370 Number of nX7 0..2 arrays with every 1 immediately preceded by 0 to the left or above, and every 2 immediately preceded by both a 1 and a 0

21, 4998, 636912, 93584344, 13204707603, 1887519232797, 268596415269518, 38282460992672716, 5453232104885876045, 776953643188694040712, 110689277453680961314489, 15769820956322189825472915

Offset

1,1

Comments

Column 7 of A203371

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..0..0..0..0..0..1....0..0..0..0..1..0..1....0..0..0..0..1..0..0
..0..1..1..1..1..2..0....0..0..1..2..0..0..1....0..0..0..1..0..1..2
..1..0..2..0..1..0..1....1..1..0..0..1..0..0....0..0..1..0..0..0..1
..0..1..0..0..2..0..1....0..2..1..2..0..0..0....0..0..0..0..1..0..0

Crossrefs

Sequence in context: A055416 A220620 A221120 * A232344 A074053 A220552

Adjacent sequences: A203367 A203368 A203369 * A203371 A203372 A203373

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved